CN106911003B - Broadband circularly polarized waveguide antenna and antenna array thereof - Google Patents
Broadband circularly polarized waveguide antenna and antenna array thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
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- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H01Q21/061—Two dimensional planar arrays
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Abstract
The invention discloses a broadband circularly polarized waveguide antenna and an antenna array thereof. The antenna comprises a radiation layer, a cavity layer, a feed network layer and a circularly polarized network layer which are sequentially stacked into a multilayer stacked structure. The radiation layer is provided with 8 multiplied by 8 radiation units which are arranged in an array mode on one side back to the cavity layer, each radiation unit comprises a circular ridge opening waveguide with symmetrical double ridges and a first coupling feed straight slot which is arranged on the bottom wall of the circular ridge opening waveguide, the double ridges are located on two opposite sides of the first coupling feed straight slot, and a vertical connecting line of the double ridges and the first coupling feed straight slot form an included angle of 45 degrees. The 8 x 8 radiating elements are divided into four groups of radiating elements, each group of radiating elements comprises 4 x 4 radiating elements which are arranged in an array manner, any group of radiating elements is taken as a fixed point reference, and the rest three groups of radiating elements rotate 90 degrees, 180 degrees and 270 degrees in turn in the anticlockwise direction or the clockwise direction.
Description
Technical Field
The invention relates to an antenna and an antenna array thereof in the fields of satellite communication and microwave communication, in particular to a broadband circularly polarized waveguide antenna and an antenna array thereof.
Background
In recent years, with the vigorous development of satellite communication, antennas applied to systems such as satellite broadcast television, communication, data transmission and the like are rapidly developed, and the demand for various antennas is rapidly increased to promote the development thereof. Such as for Direct Broadcast Satellite (DBS) communication systems, there is a need for a low profile, high efficiency antenna system to increase the G/T value of the system (G being the gain of the antenna system; T being the noise temperature of the antenna system) to increase the data rate of the antenna and satellite communications. And the effective aperture of the antenna is limited by the scanning volume of the antenna, and the low-profile antenna can obtain the maximum system gain for the given scanning volume, thereby improving the G/T value of the whole system.
Waveguide antennas are used in a large number of applications, particularly in radar systems, due to their high efficiency, ease of amplitude and phase control, and simplicity of processing. The waveguide antenna has two types of traveling wave array and standing wave array (resonance array), and the waveguide traveling wave array has wider bandwidth and frequency sweep characteristic. But the efficiency is lower, and the method is suitable for manufacturing large-scale planar arrays; the standing wave array has high efficiency and narrow bandwidth, and is suitable for being used as a small-sized planar array.
Antenna systems for receiving satellite direct broadcast communications are generally installed on airplanes or on top of automobiles, so that the antenna systems have good maneuverability, and the requirements on the antennas are higher. Such as: miniaturization, low profile, low loss, high gain, etc. In order to reduce the height of the antenna system, the antennas are generally designed as planar array antennas, and thus waveguide slot antenna arrays are well used.
In commercial satellite communication systems, the signals received and transmitted by the satellites are circularly polarized waves, so that no cross polarization component is caused no matter what angle the radar and the satellite are. That is, the satellite receives and transmits circularly polarized waves, without causing polarization mismatch and thus causing a decrease in the efficiency of data transmission.
U.S. Pat. No. 5579019 (usa patents US5579019 slot waveguide leaky-wave antennas (kohmaro and ogerma tacaca et al Masahiro Uematsu, Takashi Ojima, etc., slotted floor waveguide array antenna) and US7436371B1 low loss low profile dual polarized waveguide crescent slot antenna arrays (li. ma. paherson, coder. reis et al, Lee m. paulsen, center Rapids, etc., waveguided depletion slot array for low-loss, low-gain dual-polarization antenna) have problems of broadband operating beam pointing dispersion and reduced efficiency.
The wave and wang et al proposed a circular polarization waveguide standing wave antenna (chinese patent No. 200910185457.3), which is limited by the characteristics of waveguide standing wave slot array, i.e. the more the units, the narrower the operating bandwidth, and the narrower the axial ratio bandwidth of the circular polarization waveguide antenna, and the 3dB axial ratio bandwidth is less than 3%.
Wangwei, zimeiqing, zhangtao and the like have proposed a circularly polarized antenna (chinese patent No. 201310454644.3), in which a ridge waveguide is adopted to open two kinds of slots to realize a circularly polarized operation mode, but the circularly polarized waveguide antenna is also limited by the characteristics of a waveguide standing wave slot array, i.e., the larger the number of units, the narrower the operating bandwidth of the antenna.
In the new circular polarization waveguide slot antenna and the design method thereof (chinese patent, patent application No. 201510012239.5), the circular polarization mode is realized by opening two kinds of radiation slots on the convex waveguide tube, but the working bandwidth of the circular polarization antenna is also limited by the number of units, i.e. the more the number of units, the narrower the working bandwidth.
Disclosure of Invention
In order to overcome the defects of the circularly polarized waveguide antenna, the invention provides a broadband circularly polarized waveguide antenna and an antenna array thereof, which belong to circularly polarized waveguide antennas with simple structures, good broadband and low axial ratio characteristics and convenient for independently forming large planar arrays.
The solution of the invention is: a broadband circularly polarized waveguide antenna comprises a radiation layer, a cavity layer, a feed network layer and a circularly polarized network layer; the radiation layer, the cavity layer, the feed network layer and the circularly polarized network layer are sequentially laminated into a multilayer laminated structure; 8 multiplied by 8 radiating units which are arranged in an array mode are arranged on one side, back to the cavity layer, of the radiating layer, each radiating unit comprises a circular ridge opening waveguide with symmetrical double ridges and a coupling feed straight gap I which is arranged on the bottom wall of the circular ridge opening waveguide, the double ridges are located on two opposite sides of the coupling feed straight gap I, and a vertical connecting line of the double ridges and the coupling feed straight gap I form an included angle of 45 degrees; the 8 x 8 radiation units are divided into four groups of radiation units, each group of radiation units comprises 4 x 4 radiation units which are arranged in an array manner, any group of radiation units is taken as a fixed point reference, and the rest three groups of radiation units rotate 90 degrees, 180 degrees and 270 degrees in turn in the anticlockwise direction or the clockwise direction; the electromagnetic wave is divided into four paths of electromagnetic signals with phases different by 0 degree, 90 degrees, 180 degrees and 270 degrees in sequence through the circularly polarized network layer and then enters the feed network layer, and the radiation units with corresponding phases on the radiation layer are excited by the excitation cavity layer.
As a further improvement of the above scheme, the cavity layer includes 4 × 4 rectangular cavities arranged in an array, each rectangular cavity corresponds to 2 × 2 radiating elements arranged in an array, and a coupling feeding straight slot two is formed at the cavity bottom of each rectangular cavity and is parallel to the coupling feeding straight slot one of the corresponding radiating element.
Further, the feed network layer includes four one-to-four waveguide power splitters, and each one-to-four waveguide power splitter corresponds to 2 × 2 rectangular cavities arranged in an array.
Still further, the circularly polarized network layer comprises a one-to-four power division network formed by a 90-degree electric bridge.
Preferably, the one-to-four power division network adopts rectangular waveguide center feeding.
As a further improvement of the above scheme, a distance between two adjacent radiation units is 0.5 λ h < dx ═ dy < λ h, where λ h is a high-frequency free space wavelength, dx is a distance between two adjacent radiation units on the same row, and dy is a distance between two adjacent radiation units on the same column.
As a further improvement of the above scheme, the length Ls and the width Ws of the first coupling feed straight slot satisfy: ls is 0.5 lambda0，0.1λ0≤Ws≤0.125λ0Wherein λ is0Is the center frequency free space wavelength.
As a further improvement of the above, the width Rw and height Rh of the ridge of the circular ridge-opening waveguide are filled withFoot:
wherein the content of the first and second substances,
is the diameter of a circular ridge opening waveguide
λ0Is the center frequency free space wavelength.
Further, the length Lc and the width Wc of the coupling feeding straight slot two satisfy: lc ═ 0.5 λ0，0.1λ0≤Wc≤0.125λ0，λ0Is the center frequency free space wavelength.
The invention also provides a broadband circularly polarized waveguide antenna array, which comprises N multiplied by N antennas, wherein N is a positive integer; the antenna is any of the above broadband circularly polarized waveguide antennas.
The broadband circularly polarized waveguide antenna adopts a multilayer structure, a radiation unit combining a circular ridge open waveguide and a coupling feed straight slit is arranged on a rectangular cavity, and the characteristics of wide frequency band and low axial ratio are realized through a rotary feed and a circularly polarized network. The invention has the beneficial effects that: the circular ridge open waveguide of the straight slit coupling feed is arranged on the rectangular cavity by adopting a multilayer laminated structure, so that a circular polarization working mode is realized, the circular polarization working bandwidth is widened by the circular polarization network feed, the axial ratio in the working frequency band is reduced, and the circular ridge open waveguide is simple in structure and easy to process; by controlling the included angle between the circular ridge opening waveguide double-ridge vertical connecting line and the coupling feed gap and the phase difference of the circular polarization feed network, the broadband left-handed circular polarization waveguide antenna or the broadband right-handed circular polarization waveguide antenna can be conveniently obtained; when the array is formed, the antenna can be used as a basic module, and the large-scale planar broadband circularly polarized waveguide antenna array can be expanded through the power distribution network.
Drawings
FIG. 1 is a schematic three-dimensional external view of a broadband circularly polarized waveguide antenna according to the present invention;
FIG. 2 is a schematic diagram of a layered structure of the broadband circularly polarized waveguide antenna of FIG. 1;
fig. 3 is a top view of a broadband circularly polarized waveguide antenna according to embodiment 1 of the present invention;
fig. 4 is a bottom view of a broadband circularly polarized waveguide antenna according to embodiment 1 of the present invention;
fig. 5 is a central frequency direction graph of the broadband circularly polarized waveguide antenna according to embodiment 1 of the present invention;
FIG. 6 is a graph showing the axial ratio of the center frequency of the broadband circularly polarized waveguide antenna according to embodiment 1 of the present invention;
FIG. 7 is an axial ratio-frequency plot of a broadband circularly polarized waveguide antenna according to example 1 of the present invention;
FIG. 8 is a standing wave ratio-frequency curve of the broadband circularly polarized waveguide antenna according to embodiment 1 of the present invention;
fig. 9 is a schematic three-dimensional structure diagram of an array antenna formed by expanding the 4 broadband circularly polarized waveguide antennas in fig. 1;
fig. 10 is a bottom view of the array antenna of fig. 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, the broadband circularly polarized waveguide antenna of the present invention includes a radiation layer 1, a cavity layer 2, a feeding network layer 3, and a circularly polarized network layer 4. The radiation layer 1, the cavity layer 2, the feed network layer 3 and the circularly polarized network layer 4 are sequentially stacked into a multilayer stacked structure. The electromagnetic waves re-enter the feed network layer 3 through the circularly polarized network layer 4, and the respective radiation elements 5 of the corresponding phase on the radiation layer 1 are de-excited by the excitation cavity layer 2.
Referring to fig. 3 and 4, fig. 1 to 4 are a schematic structural diagram, a schematic layered structure diagram, a top view and a top view of the broadband circularly polarized waveguide antenna of the present invention, showing the detailed structure of the broadband waveguide antenna of the present invention. On the side of the radiation layer 1 facing away from the cavity layer 2, 8 × 8 radiation elements 5 are arranged in an array, and each radiation element 5 includes a circular ridge open waveguide 6 having a symmetrical double ridge 61 and a coupling feed straight slot one 7 opened on the bottom wall 62 of the circular ridge open waveguide 6. The double ridges 61 are located on two opposite sides of the first coupling feed straight slot 7, and a vertical connection line of the double ridges 61 forms an included angle of 45 degrees with the first coupling feed straight slot 7. The 8 × 8 radiation units 5 are divided into four groups of radiation units, each group of radiation units includes 4 × 4 radiation units 5 arranged in an array, any group of radiation units is used as a fixed point reference, and the rest three groups of radiation units rotate 90 degrees, 180 degrees and 270 degrees in the counterclockwise direction or the clockwise direction. That is, four sets of radiation unit groups may be defined as 0 degrees, 90 degrees, 180 degrees, and 270 degrees in order in azimuth angle. The electromagnetic wave is divided into four paths of electromagnetic signals with phases different by 0 degree, 90 degrees, 180 degrees and 270 degrees in sequence through the circularly polarized network layer 4, and then enters the feed network layer 3, and the radiation units 5 with corresponding phases on the radiation layer 1 are de-excited through the excitation cavity layer 2.
The invention adopts a multilayer laminated structure, the radiation layer 1 on the cavity layer 2 is provided with the circular ridge open waveguide 6 with a coupling feed straight gap, the working mode of circular polarization is realized, the feed is carried out through the circular polarization network 4, the working bandwidth of circular polarization is widened, the axial ratio in the working frequency band is reduced, the structure is simple, and the processing is easy; by controlling the included angle between the double-ridge 61 vertical connecting line of the circular ridge opening waveguide 6 and the coupling feed straight gap I7 and the feed phase difference of the circularly polarized network 4, the broadband left-handed circularly polarized waveguide antenna or the broadband right-handed circularly polarized waveguide antenna can be conveniently obtained.
The radiation unit 5 can adopt the form of slotting on radiation layer 1 earlier in the design, opens two arc recesses, and break through two arc recesses and form the passageway again, and the both sides of passageway then form two ridges, then height, width, the length of adjusting two ridges, set up straight gap at last, and the both ends in this straight gap extend respectively and extend to two recesses from the both ends of passageway, consequently the straight gap is located the diapire of two recesses through the passageway.
The cavity layer 2 may include 4 × 4 rectangular cavities 8 arranged in an array, each rectangular cavity 8 corresponds to 2 × 2 radiating elements 5 arranged in an array, a coupling feeding straight slot two 9 is formed at the cavity bottom of each rectangular cavity 8, and the coupling feeding straight slot two 9 is parallel to the coupling feeding straight slot one 7 of the corresponding radiating element 5. The feed network layer 3 may include four one-to-four waveguide power splitters 10, and each one-to-four waveguide power splitter 10 corresponds to 2 × 2 rectangular cavities 8 arranged in an array. The circularly polarized network layer 4 may include a one-to-four power dividing network 11 formed by a 90-degree bridge, and the one-to-four power dividing network 11 may be center-fed by a rectangular waveguide 12.
In conclusion, the broadband circularly polarized waveguide antenna solves the problems of narrow working bandwidth, poor axial ratio and the like of the conventional circularly polarized waveguide antenna. The invention mainly comprises a radiation layer, a cavity layer, a feed network layer and a circular polarization network layer; the radiation layer is mainly formed by a radiation unit array, each radiation unit mainly comprises a circular ridge opening waveguide and a coupling feed gap, the circular ridge opening waveguide is a symmetrical ridge circular waveguide, and the symmetrical axes of the upper ridge and the lower ridge of the circular ridge opening waveguide and the coupling feed gap form an included angle of 45 degrees; a single cavity excites the 2X 2 circular ridge open waveguide, and a 4X 4 circular ridge open waveguide array antenna is formed through a power division network dividing four into four; the broadband circularly polarized waveguide antenna is realized by sequentially rotating the 4 multiplied by 4 circular ridge opening waveguide array antenna by 90 degrees, 180 degrees and 270 degrees and by a circularly polarized feed network. The antenna of the invention has simple and compact structure, high radiation efficiency and wide working bandwidth, and the axial ratio of the antenna is less than 1dB and the standing-wave ratio of the port is less than 1.3 within 16 percent of the working bandwidth.
When the broadband circularly polarized waveguide antenna is arrayed, the antenna can be used as a basic module, and a large-scale planar broadband circularly polarized waveguide antenna array can be expanded through a power distribution network.
Example 1
Referring again to fig. 3 and 4, first, the following are defined: the diameter of the circular ridge opening waveguide 6 is
Height Ch, ridge width Rw, ridge height Rh; the length of the coupling feed straight gap I7 is Ls, the width of the coupling feed straight gap I is Ws, and the thickness of the metal wall is t; the length of the rectangular cavity 8 is a, the width is b, and the height is h; length of coupled feeding straight slot two 9Lc and width Wc.
A preferred embodiment of the present invention is a 64-element broadband circularly polarized waveguide antenna in a uniformly distributed X-band, center-fed using a standard rectangular waveguide 12, as shown in fig. 1-5. The operating center frequency is f0, the lower side frequency is fL, the upper side frequency is fH, and 10 GHz, 9.2 GHz, and 10.8GHz are selected respectively in this embodiment.
The broadband circularly polarized waveguide antenna mainly comprises a radiation layer 1, a cavity layer 2, a feed network layer 3 and a circularly polarized network layer 4. The radiation layer 1 mainly comprises a circular open waveguide 6 and a coupling feed gap 7; the cavity layer 2 mainly comprises a rectangular cavity 8 and a coupling feed straight slit II 9; the feed network layer 3 mainly comprises 4 one-to-four power division networks 10; the circularly polarized network layer 4 mainly consists of a one-to-four network 11 formed by 90-degree electric bridges, and can adopt a standard rectangular waveguide tube 12 to carry out center feeding.
The distance between two adjacent radiation elements 5 is 0.5 λ h < dx ═ dy < λ h, where λ h is the high-frequency free space wavelength, dx is the distance between two adjacent radiation elements 5 on the same row, and dy is the distance between two adjacent radiation elements 5 on the same column, and this embodiment is preferably 22 mm.
The dimensions of the circular ridge-open waveguide 6 are: diameter of
(λ0Center frequency free space wavelength), this embodiment is preferably 21 mm; height Ch of 0mm<Ch<0.5λ0The present embodiment is preferably 9.8 mm; the width Rw of the ridge satisfies:
this embodiment is preferably 2 mm; the height Rh of the ridge satisfies:
this embodiment is preferably 1.5 mm.
The size of the coupling feed straight slot one 7 is as follows: the length Ls satisfies: ls is 0.5 λ 0, preferably 15mm in this embodiment; the width Ws satisfies: 0.1 lambda 0 & lt, Ws & lt, 0.125 lambda 0, preferably 2mm in this embodiment.
The metal wall thickness t is determined by the processing capacity, and the thickness in the embodiment is preferably 0.8 mm.
The dimensions of the rectangular cavity 8 are: length a is 2dx-t, preferably 33.2mm in this embodiment; width b is 2dy-t, and the embodiment is preferably 33.2 mm; the height is 0mm < h < λ 0, preferably 15.5mm in this embodiment.
The size of the coupling feed straight slot two 9 is as follows: the length Lc satisfies: lc is 0.5 λ 0, the present embodiment is preferably 15mm, and the width Wc satisfies: 0.1 lambda 0 & lt, Wc & lt, 0.125 lambda 0, preferably 2mm in this embodiment.
Electromagnetic waves enter the circularly polarized network 4 through the feed port 12, are divided into 4 paths of electromagnetic signals (the phase difference is 0 degree, 90 degrees, 180 degrees and 270 degrees), enter the feed network layer 3, excite the rectangular cavity 8 through the coupling feed straight gap II 9, and then are coupled with the feed circular ridge open waveguide 6 through the coupling feed straight gap I7 to radiate the electromagnetic waves outside.
Referring to fig. 5 to 8, a central frequency directional diagram curve, a central frequency axial ratio curve, an axial ratio-frequency curve and a standing wave contrast-frequency curve of the 64-unit broadband circularly polarized waveguide antenna in the embodiment of the invention are shown, and it can be seen that the invention has good standing wave bandwidth and axial ratio bandwidth.
Example 2
When array formation is performed, the antenna in embodiment 1 may be used as a basic module, and a large planar broadband circularly polarized waveguide array antenna may be extended through a power distribution network. The broadband circularly polarized waveguide antenna array comprises N multiplied by N broadband circularly polarized waveguide antennas, wherein N is a positive integer.
In another preferred embodiment of the present invention, as shown in fig. 9-10, the wideband circularly polarized waveguide antenna array is formed by translating 4 64-element wideband circularly polarized waveguide antennas shown in fig. 1, and feeding the antennas by using a four-in-one waveguide power divider, so as to form a larger wideband circularly polarized waveguide antenna array.
The foregoing is a detailed description of the present invention in connection with specific preferred embodiments and is not intended to limit the practice of the invention to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions, such as changes in the number of radiating elements and the form of the aperture, can be made without departing from the inventive concept, and should be considered as belonging to the scope of protection of the invention as determined by the claims submitted.
Claims (7)
1. The utility model provides a broadband circular polarization waveguide antenna, its includes radiation layer (1), cavity layer (2), feed network layer (3), sets up 8X 8 radiating element (5) that are array arrangement on one side of radiation layer (1) cavity layer (2) dorsad, and 8X 8 radiating element (5) divide into four groups of radiating element groups, including 4X 4 radiating element (5) that are array arrangement in every group radiating element group, its characterized in that: the system also comprises a circularly polarized network layer (4); the radiation layer (1), the cavity layer (2), the feed network layer (3) and the circularly polarized network layer (4) are sequentially stacked into a multilayer stacked structure; each radiating unit (5) comprises a circular ridge open waveguide (6) with symmetrical double ridges (61) and a coupling feed straight slot I (7) arranged on the bottom wall (62) of the circular ridge open waveguide (6), the double ridges (61) are positioned on two opposite sides of the coupling feed straight slot I (7), and the vertical connecting line of the double ridges (61) and the coupling feed straight slot I (7) form an included angle of 45 degrees; taking any group of radiation unit groups as fixed point reference, and sequentially rotating the rest three groups of radiation unit groups by 90 degrees, 180 degrees and 270 degrees in the anticlockwise direction or the clockwise direction; electromagnetic waves are divided into four paths of electromagnetic signals with phases different by 0 degree, 90 degrees, 180 degrees and 270 degrees in sequence through the circularly polarized network layer (4) and then enter the feed network layer (3), and the radiation units (5) with corresponding phases on the radiation layer (1) are excited through the excitation cavity layer (2);
the cavity layer (2) comprises 4 x 4 rectangular cavities (8) which are arranged in an array manner, each rectangular cavity (8) corresponds to 2 x 2 radiating units (5) which are arranged in an array manner, the cavity bottom of each rectangular cavity (8) is provided with a coupling feed straight gap II (9), and the coupling feed straight gap II (9) is parallel to the coupling feed straight gap I (7) of the corresponding radiating unit (5);
the feed network layer (3) comprises four one-to-four waveguide power dividers (10), and each one-to-four waveguide power divider (10) corresponds to 2 multiplied by 2 rectangular cavities (8) which are arranged in an array manner;
the distance between two adjacent radiation units (5) is 0.5 lambdah<dx=dy<λhWherein λ ishAnd dx is the distance between two adjacent radiation units (5) on the same row, and dy is the distance between two adjacent radiation units (5) on the same column, which is the free space wavelength of the highest frequency in the working bandwidth of the antenna.
2. The broadband circularly polarized waveguide antenna of claim 1, wherein: the circularly polarized network layer (4) comprises a one-to-four power division network (11) formed by a 90-degree electric bridge.
3. The broadband circularly polarized waveguide antenna of claim 2, wherein: the one-to-four power distribution network (11) adopts a rectangular waveguide tube (12) to feed electricity in the center.
4. The broadband circularly polarized waveguide antenna of claim 1, wherein: the length Ls and the width Ws of the coupling feed straight slot I (7) satisfy the following conditions: ls =0.5 λ0，0.1λ0≤Ws≤0.125λ0Wherein λ is0Is the center frequency free space wavelength.
5. The broadband circularly polarized waveguide antenna of claim 1, wherein: the width Rw and height Rh of the ridge (61) of the circular ridge opening waveguide (6) satisfy: 0.5mm<Rw<Ø，0.5mm<Rh<0.5 Ø, wherein Ø is the diameter of the circular ridge open waveguide (6) and Ø =0.7 λ0，λ0Is the center frequency free space wavelength.
6. The broadband circularly polarized waveguide antenna of claim 2, wherein: the length Lc and the width Wc of the coupling feeding straight slot two (9) satisfy: lc =0.5 λ0，0.1λ0≤Wc≤0.125λ0，λ0Is the center frequency free space wavelength.
7. A broadband circularly polarized waveguide antenna array comprises N multiplied by N antennas, wherein N is a positive integer; the method is characterized in that: the antenna is a broadband circularly polarized waveguide antenna according to any one of claims 1 to 6.
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| CN103414030A (en) * | 2013-07-18 | 2013-11-27 | 北京遥测技术研究所 | Wide band low profile flat plate slot array antenna |
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| CN101572354A (en) * | 2009-06-12 | 2009-11-04 | 北京航空航天大学 | Microstrip sequential rotation array antenna based on series and parallel feeding network |
| CN103414030A (en) * | 2013-07-18 | 2013-11-27 | 北京遥测技术研究所 | Wide band low profile flat plate slot array antenna |
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| CN106911003A (en) | 2017-06-30 |
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